Originally Posted by AlsoFishes
Hang on a sec. Is the insurance with Royal Mail or with Parcel Force? Because Royal Mail only do up to 2KG parcels (no good for rifles) and Parcel Force are a different shower of ***t altogether. And Post Office a third one, which sells the services of the other two.
PF are Royal Mail. Post Office counters just sell their services.
International posting rules are complex, and very restrictive in many countries not just the UK. Try sending 2nd hand auto parts to the Nirth America....